If the frame below the playhead isn’t representative of the rest of the clip, reposition the playhead and reapply the effect. The color that iMovie removes is based on the dominant color in the frame at the position of the playhead when you choose Green/Blue Screen from the pop-up menu.

Because the clips are connected, the two clips move together if you rearrange clips in the timeline. In the viewer, iMovie removes the green or blue from the green-screen clip to reveal the background clip behind your subject. If the video overlay controls aren’t shown, click the Video Overlay Settings button above the viewer, then choose Green/Blue Screen from the pop-up menu.Select the green screen footage you want to use. Drag and drop the background video or image into the timeline. Because the clips are connected, the two clips move together when you rearrange clips in the timeline. Select the background you would like to use. Trim and move the background video clip to match the length of your green-screen clip.Add the green-screen clip above the background clip in the timeline.Tap Auto to automatically remove the blue or green screen backgrounds in order to add in a background of your choice. Then tap More button (three dots) then select Green/Blue screen. Click Add Media button, then from the pop up list select green-screen clip. With your project open, add the background video clip or still image to the timeline. Open iMovie and open your video clip or photo. Use Green Screen Effects in iMovie : To use green screen in iMovie, first you need to start with an empty project and select the background you would like to.

How to add green screen on imovie